// using System.Diagnostics.CodeAnalysis;
// using System.Runtime.CompilerServices;

// namespace SJK.Functional;

// public sealed class None<T> : IOption<T>
// {

//   public static None<T> Of() => new();
//   [MethodImpl(MethodImplOptions.AggressiveInlining)]
//   public TResult Match<TResult>(Func<T, TResult> _, Func<TResult> onNone) =>
//     onNone();

//   [MethodImpl(MethodImplOptions.AggressiveInlining)] 
//  public void Match(Action<T> onSome, Action onNone) => onNone();
//  [MethodImpl(MethodImplOptions.AggressiveInlining)]
//   public IOption<TResult> Bind<TResult>(Func<T, IOption<TResult>> f) => new None<TResult>();
// [MethodImpl(MethodImplOptions.AggressiveInlining)]
//   public IOption<TResult> Map<TResult>(Func<T, TResult> f) => new None<TResult>();
// [MethodImpl(MethodImplOptions.AggressiveInlining)]
//   public T Or(T aDefault) => aDefault;
//   public T Or(Func<T> aDefault)=>aDefault();
// public bool HasValue([NotNullWhen(true)]out T? value) => (value = default) is not null && false;
// public bool HasValue() => false;
//     public override string ToString()
//     {
//         return nameof(None<T>);
//     }

//     public bool Equals(IOption<T>? other)=> other is None<T>;
// }